To let the cat out of the bag

Meaning

To reveal a secret

Examples

• John: 'Don't <b>let the cat out of the bag</b> about the surprise party!'<br>
• Alice: 'Don't worry, my lips are sealed.'
• John: 'Oh no! Now the whole office will know.'
• Alice: 'Oops, I think I <b>let the cat out of the bag</b> about the promotion.'<br>